grub boot to "1" "S" or "single"

chakkerz · 12-08-2009, 08:06 PM

I have a silly (?) trivia question: what is the difference between appending "1" OR "S" or "single" to the end of the grub boot line?

I'm not sure single works, since i've pretty much only used 1 for a few years now, but i don't notice a difference between 1 and S, but vaguely recall that there was/should be/is some sort of difference.

Any ideas?

jhwilliams · 12-08-2009, 09:34 PM

Do you mean appending a string "1", "S" or "single" to a line in a Grub boot configuration which reads as the string "boot"?

Code:

boot 1

vs.

Code:

boot single

?

According to GRUB documentation, the boot command takes no arguments. I'd be surprised to hear that grub didn't complain about this -- if I have understood you correctly -- but in that case, then, none of them should have any particular effect.

Are you referring to some argument to the kernel? http://www.mjmwired.net/kernel/Docum...parameters.txt ?

chakkerz · 12-09-2009, 12:35 AM

I was talking about effectively modifying the kernel line in the /boot/grub/grub.conf file at boot time by editing it from grub.
The process is described for example here: http://kbase.redhat.com/faq/docs/DOC-9459

The kernel documentation only cites S , but not single or 1 ... so that doesn't clear anything up